How close is the complete destruction of our environment? For us humans.

I%26#039;d say we have about 49 years at the rate we%26#039;re going. But if we cleanup our act, and the world, we might be able to live a sustainable lifestyle for eternity. ~MaDiSoN

Not very close. The Earth has been in worse situations back through history and prehistory, and we%26#039;re still here.
i.e. Ice Ages

its like a couple million years away i think